Check this out:

18 Oct 2013 18:24:50 No data received from host in the last 250s OK High 2d 15h 27m No -
18 Oct 2013 18:27:00 No data received from host in the last 250s PROBLEM High 2m 10s No Ok
18 Oct 2013 18:21:50 No data received from host in the last 250s OK High 5m 10s No Ok
18 Oct 2013 18:25:00 No data received from host in the last 250s PROBLEM High 3m 10s No Ok
18 Oct 2013 18:20:50 No data received from host in the last 250s OK High 4m 10s No Ok
18 Oct 2013 18:15:30 No data received from host in the last 250s PROBLEM High 5m 20s No Ok

After some flapping, the trigger finally recovered. However I still receive alerts from the event generared at 18:27:00. Also, timetamps are out of order, not sure what the problem is there.

Regards,
Matteo